2 * Copyright (c) 2010 Stefano Sabatini
3 * Copyright (c) 2010 Baptiste Coudurier
4 * Copyright (c) 2007 Bobby Bingham
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * overlay one video on top of another
30 #include "libavutil/common.h"
31 #include "libavutil/eval.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/mathematics.h"
36 #include "libavutil/opt.h"
38 #include "dualinput.h"
39 #include "drawutils.h"
42 static const char *const var_names[] = {
43 "main_w", "W", ///< width of the main video
44 "main_h", "H", ///< height of the main video
45 "overlay_w", "w", ///< width of the overlay video
46 "overlay_h", "h", ///< height of the overlay video
51 "n", ///< number of frame
52 "pos", ///< position in the file
53 "t", ///< timestamp expressed in seconds
60 VAR_OVERLAY_W, VAR_OW,
61 VAR_OVERLAY_H, VAR_OH,
78 static const char *eof_action_str[] = {
79 "repeat", "endall", "pass"
94 typedef struct OverlayContext {
96 int x, y; ///< position of overlayed picture
99 uint8_t main_is_packed_rgb;
100 uint8_t main_rgba_map[4];
101 uint8_t main_has_alpha;
102 uint8_t overlay_is_packed_rgb;
103 uint8_t overlay_rgba_map[4];
104 uint8_t overlay_has_alpha;
105 enum OverlayFormat { OVERLAY_FORMAT_YUV420, OVERLAY_FORMAT_YUV422, OVERLAY_FORMAT_YUV444, OVERLAY_FORMAT_RGB, OVERLAY_FORMAT_NB} format;
106 enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode;
108 FFDualInputContext dinput;
110 int main_pix_step[4]; ///< steps per pixel for each plane of the main output
111 int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay
112 int hsub, vsub; ///< chroma subsampling values
114 double var_values[VAR_VARS_NB];
115 char *x_expr, *y_expr;
117 enum EOFAction eof_action; ///< action to take on EOF from source
119 AVExpr *x_pexpr, *y_pexpr;
122 static av_cold void uninit(AVFilterContext *ctx)
124 OverlayContext *s = ctx->priv;
126 ff_dualinput_uninit(&s->dinput);
127 av_expr_free(s->x_pexpr); s->x_pexpr = NULL;
128 av_expr_free(s->y_pexpr); s->y_pexpr = NULL;
131 static inline int normalize_xy(double d, int chroma_sub)
135 return (int)d & ~((1 << chroma_sub) - 1);
138 static void eval_expr(AVFilterContext *ctx)
140 OverlayContext *s = ctx->priv;
142 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
143 s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
144 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
145 s->x = normalize_xy(s->var_values[VAR_X], s->hsub);
146 s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);
149 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
156 ret = av_expr_parse(pexpr, expr, var_names,
157 NULL, NULL, NULL, NULL, 0, log_ctx);
159 av_log(log_ctx, AV_LOG_ERROR,
160 "Error when evaluating the expression '%s' for %s\n",
170 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
171 char *res, int res_len, int flags)
173 OverlayContext *s = ctx->priv;
176 if (!strcmp(cmd, "x"))
177 ret = set_expr(&s->x_pexpr, args, cmd, ctx);
178 else if (!strcmp(cmd, "y"))
179 ret = set_expr(&s->y_pexpr, args, cmd, ctx);
181 ret = AVERROR(ENOSYS);
186 if (s->eval_mode == EVAL_MODE_INIT) {
188 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
189 s->var_values[VAR_X], s->x,
190 s->var_values[VAR_Y], s->y);
195 static int query_formats(AVFilterContext *ctx)
197 OverlayContext *s = ctx->priv;
199 /* overlay formats contains alpha, for avoiding conversion with alpha information loss */
200 static const enum AVPixelFormat main_pix_fmts_yuv420[] = {
201 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
203 static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {
204 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE
207 static const enum AVPixelFormat main_pix_fmts_yuv422[] = {
208 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
210 static const enum AVPixelFormat overlay_pix_fmts_yuv422[] = {
211 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_NONE
214 static const enum AVPixelFormat main_pix_fmts_yuv444[] = {
215 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
217 static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {
218 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE
221 static const enum AVPixelFormat main_pix_fmts_rgb[] = {
222 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
223 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
224 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
227 static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {
228 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
229 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
233 AVFilterFormats *main_formats;
234 AVFilterFormats *overlay_formats;
237 case OVERLAY_FORMAT_YUV420:
238 main_formats = ff_make_format_list(main_pix_fmts_yuv420);
239 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420);
241 case OVERLAY_FORMAT_YUV422:
242 main_formats = ff_make_format_list(main_pix_fmts_yuv422);
243 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv422);
245 case OVERLAY_FORMAT_YUV444:
246 main_formats = ff_make_format_list(main_pix_fmts_yuv444);
247 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444);
249 case OVERLAY_FORMAT_RGB:
250 main_formats = ff_make_format_list(main_pix_fmts_rgb);
251 overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb);
257 ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats);
258 ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);
259 ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats );
264 static const enum AVPixelFormat alpha_pix_fmts[] = {
265 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P,
266 AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,
267 AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE
270 static int config_input_main(AVFilterLink *inlink)
272 OverlayContext *s = inlink->dst->priv;
273 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
275 av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);
277 s->hsub = pix_desc->log2_chroma_w;
278 s->vsub = pix_desc->log2_chroma_h;
280 s->main_is_packed_rgb =
281 ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;
282 s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
286 static int config_input_overlay(AVFilterLink *inlink)
288 AVFilterContext *ctx = inlink->dst;
289 OverlayContext *s = inlink->dst->priv;
291 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
293 av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc);
295 /* Finish the configuration by evaluating the expressions
296 now when both inputs are configured. */
297 s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
298 s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
299 s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
300 s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
301 s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
302 s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
303 s->var_values[VAR_X] = NAN;
304 s->var_values[VAR_Y] = NAN;
305 s->var_values[VAR_N] = 0;
306 s->var_values[VAR_T] = NAN;
307 s->var_values[VAR_POS] = NAN;
309 if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
310 (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
313 s->overlay_is_packed_rgb =
314 ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;
315 s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);
317 if (s->eval_mode == EVAL_MODE_INIT) {
319 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
320 s->var_values[VAR_X], s->x,
321 s->var_values[VAR_Y], s->y);
324 av_log(ctx, AV_LOG_VERBOSE,
325 "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s eof_action:%s\n",
326 ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,
327 av_get_pix_fmt_name(ctx->inputs[MAIN]->format),
328 ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,
329 av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format),
330 eof_action_str[s->eof_action]);
334 static int config_output(AVFilterLink *outlink)
336 AVFilterContext *ctx = outlink->src;
337 OverlayContext *s = ctx->priv;
340 if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
343 outlink->w = ctx->inputs[MAIN]->w;
344 outlink->h = ctx->inputs[MAIN]->h;
345 outlink->time_base = ctx->inputs[MAIN]->time_base;
350 // divide by 255 and round to nearest
351 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16
352 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)
354 // calculate the unpremultiplied alpha, applying the general equation:
355 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )
356 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x
357 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)
358 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))
361 * Blend image in src to destination buffer dst at position (x, y).
363 static void blend_image(AVFilterContext *ctx,
364 AVFrame *dst, const AVFrame *src,
367 OverlayContext *s = ctx->priv;
368 int i, imax, j, jmax, k, kmax;
369 const int src_w = src->width;
370 const int src_h = src->height;
371 const int dst_w = dst->width;
372 const int dst_h = dst->height;
374 if (x >= dst_w || x+src_w < 0 ||
375 y >= dst_h || y+src_h < 0)
376 return; /* no intersection */
378 if (s->main_is_packed_rgb) {
379 uint8_t alpha; ///< the amount of overlay to blend on to main
380 const int dr = s->main_rgba_map[R];
381 const int dg = s->main_rgba_map[G];
382 const int db = s->main_rgba_map[B];
383 const int da = s->main_rgba_map[A];
384 const int dstep = s->main_pix_step[0];
385 const int sr = s->overlay_rgba_map[R];
386 const int sg = s->overlay_rgba_map[G];
387 const int sb = s->overlay_rgba_map[B];
388 const int sa = s->overlay_rgba_map[A];
389 const int sstep = s->overlay_pix_step[0];
390 const int main_has_alpha = s->main_has_alpha;
391 uint8_t *s, *sp, *d, *dp;
394 sp = src->data[0] + i * src->linesize[0];
395 dp = dst->data[0] + (y+i) * dst->linesize[0];
397 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
400 d = dp + (x+j) * dstep;
402 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
405 // if the main channel has an alpha channel, alpha has to be calculated
406 // to create an un-premultiplied (straight) alpha value
407 if (main_has_alpha && alpha != 0 && alpha != 255) {
408 uint8_t alpha_d = d[da];
409 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
421 // main_value = main_value * (1 - alpha) + overlay_value * alpha
422 // since alpha is in the range 0-255, the result must divided by 255
423 d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha);
424 d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha);
425 d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha);
427 if (main_has_alpha) {
435 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
436 d[da] += FAST_DIV255((255 - d[da]) * s[sa]);
442 dp += dst->linesize[0];
443 sp += src->linesize[0];
446 const int main_has_alpha = s->main_has_alpha;
447 if (main_has_alpha) {
448 uint8_t alpha; ///< the amount of overlay to blend on to main
449 uint8_t *s, *sa, *d, *da;
452 sa = src->data[3] + i * src->linesize[3];
453 da = dst->data[3] + (y+i) * dst->linesize[3];
455 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {
460 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {
462 if (alpha != 0 && alpha != 255) {
463 uint8_t alpha_d = *d;
464 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
473 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha
474 *d += FAST_DIV255((255 - *d) * *s);
479 da += dst->linesize[3];
480 sa += src->linesize[3];
483 for (i = 0; i < 3; i++) {
484 int hsub = i ? s->hsub : 0;
485 int vsub = i ? s->vsub : 0;
486 int src_wp = FF_CEIL_RSHIFT(src_w, hsub);
487 int src_hp = FF_CEIL_RSHIFT(src_h, vsub);
488 int dst_wp = FF_CEIL_RSHIFT(dst_w, hsub);
489 int dst_hp = FF_CEIL_RSHIFT(dst_h, vsub);
492 uint8_t *s, *sp, *d, *dp, *a, *ap;
495 sp = src->data[i] + j * src->linesize[i];
496 dp = dst->data[i] + (yp+j) * dst->linesize[i];
497 ap = src->data[3] + (j<<vsub) * src->linesize[3];
499 for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {
505 for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {
506 int alpha_v, alpha_h, alpha;
508 // average alpha for color components, improve quality
509 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
510 alpha = (a[0] + a[src->linesize[3]] +
511 a[1] + a[src->linesize[3]+1]) >> 2;
512 } else if (hsub || vsub) {
513 alpha_h = hsub && k+1 < src_wp ?
514 (a[0] + a[1]) >> 1 : a[0];
515 alpha_v = vsub && j+1 < src_hp ?
516 (a[0] + a[src->linesize[3]]) >> 1 : a[0];
517 alpha = (alpha_v + alpha_h) >> 1;
520 // if the main channel has an alpha channel, alpha has to be calculated
521 // to create an un-premultiplied (straight) alpha value
522 if (main_has_alpha && alpha != 0 && alpha != 255) {
523 // average alpha for color components, improve quality
525 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {
526 alpha_d = (d[0] + d[src->linesize[3]] +
527 d[1] + d[src->linesize[3]+1]) >> 2;
528 } else if (hsub || vsub) {
529 alpha_h = hsub && k+1 < src_wp ?
530 (d[0] + d[1]) >> 1 : d[0];
531 alpha_v = vsub && j+1 < src_hp ?
532 (d[0] + d[src->linesize[3]]) >> 1 : d[0];
533 alpha_d = (alpha_v + alpha_h) >> 1;
536 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);
538 *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);
543 dp += dst->linesize[i];
544 sp += src->linesize[i];
545 ap += (1 << vsub) * src->linesize[3];
551 static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic,
552 const AVFrame *second)
554 OverlayContext *s = ctx->priv;
555 AVFilterLink *inlink = ctx->inputs[0];
558 if (s->eval_mode == EVAL_MODE_FRAME) {
559 int64_t pos = av_frame_get_pkt_pos(mainpic);
561 s->var_values[VAR_N] = inlink->frame_count;
562 s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?
563 NAN : mainpic->pts * av_q2d(inlink->time_base);
564 s->var_values[VAR_POS] = pos == -1 ? NAN : pos;
567 av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",
568 s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],
569 s->var_values[VAR_X], s->x,
570 s->var_values[VAR_Y], s->y);
573 blend_image(ctx, mainpic, second, s->x, s->y);
577 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
579 OverlayContext *s = inlink->dst->priv;
580 return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);
583 static int request_frame(AVFilterLink *outlink)
585 OverlayContext *s = outlink->src->priv;
586 return ff_dualinput_request_frame(&s->dinput, outlink);
589 static av_cold int init(AVFilterContext *ctx)
591 OverlayContext *s = ctx->priv;
593 if (s->allow_packed_rgb) {
594 av_log(ctx, AV_LOG_WARNING,
595 "The rgb option is deprecated and is overriding the format option, use format instead\n");
596 s->format = OVERLAY_FORMAT_RGB;
598 if (!s->dinput.repeatlast || s->eof_action == EOF_ACTION_PASS) {
599 s->dinput.repeatlast = 0;
600 s->eof_action = EOF_ACTION_PASS;
602 if (s->dinput.shortest || s->eof_action == EOF_ACTION_ENDALL) {
603 s->dinput.shortest = 1;
604 s->eof_action = EOF_ACTION_ENDALL;
607 s->dinput.process = do_blend;
611 #define OFFSET(x) offsetof(OverlayContext, x)
612 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
614 static const AVOption overlay_options[] = {
615 { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
616 { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
617 { "eof_action", "Action to take when encountering EOF from secondary input ",
618 OFFSET(eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
619 EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, "eof_action" },
620 { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, "eof_action" },
621 { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, "eof_action" },
622 { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, "eof_action" },
623 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
624 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
625 { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
626 { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },
627 { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
628 { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },
629 { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },
630 { "yuv422", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV422}, .flags = FLAGS, .unit = "format" },
631 { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },
632 { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },
633 { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
637 AVFILTER_DEFINE_CLASS(overlay);
639 static const AVFilterPad avfilter_vf_overlay_inputs[] = {
642 .type = AVMEDIA_TYPE_VIDEO,
643 .config_props = config_input_main,
644 .filter_frame = filter_frame,
649 .type = AVMEDIA_TYPE_VIDEO,
650 .config_props = config_input_overlay,
651 .filter_frame = filter_frame,
656 static const AVFilterPad avfilter_vf_overlay_outputs[] = {
659 .type = AVMEDIA_TYPE_VIDEO,
660 .config_props = config_output,
661 .request_frame = request_frame,
666 AVFilter ff_vf_overlay = {
668 .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),
671 .priv_size = sizeof(OverlayContext),
672 .priv_class = &overlay_class,
673 .query_formats = query_formats,
674 .process_command = process_command,
675 .inputs = avfilter_vf_overlay_inputs,
676 .outputs = avfilter_vf_overlay_outputs,
677 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,